Bug 65

Bug Description:

This is a deadlock.
The following is an example deadlock threads:

"Thread-1": waiting to lock monitor 0x00000000062a6ce0 (object 0x00000000ec278078, a
    org.apache.commons.pool.impl.GenericKeyedObjectPool), which is held by "Thread-0" 
"Thread-0": waiting to lock monitor 0x00000000076790e8 (object 0x00000000ec280078, a
    org.apache.commons.dbcp.PoolingConnection), which is held by "Thread-1"
    
Java stack information for the threads listed above:
===================================================
Thread-1:
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.borrowObject(GenericKeyedObjectPool.java:715)
      - waiting to lock <0x00000000ec2b0070> (a org.apache.commons.pool.impl.GenericKeyedObjectPool)
    at org.apache.commons.dbcp.PoolingConnection.prepareStatement(PoolingConnection.java:87)
      - locked <0x00000000ec2a80d8> (a org.apache.commons.dbcp.PoolingConnection)
    at Dbcp65$Thread2.run(Dbcp65.java:86)
        
Thread-0:
    at org.apache.commons.dbcp.AbandonedTrace.addTrace(AbandonedTrace.java:173) 
      - waiting to lock <0x00000000ec2a80d8> (a org.apache.commons.dbcp.PoolingConnection)
    at org.apache.commons.dbcp.PoolablePreparedStatement.activate(PoolablePreparedStatement.java:92)
    at org.apache.commons.dbcp.PoolingConnection.activateObject(PoolingConnection.java:228)
    at org.apache.commons.pool.impl.GenericKeyedObjectPool.evict(GenericKeyedObjectPool.java:991) 
      - locked <0x00000000ec2b0070> (a org.apache.commons.pool.impl.GenericKeyedObjectPool)
    at Dbcp65$Thread1.run(Dbcp65.java:74)

    

More details about this bug are at DBCP-65 JIRA page.

How To Reproduce:

This bug is reproduced under dbcp 1.2 and JDK 1.6_33.
Execute the following scripts to run the test to reproduce the bug (assume the location of the dbcp test project is dbcp_test_home).

Example:

Use monitor to report and terminate the program when deadlock happens:
${dbcp_test_home}/scripts/270.sh

Turn off monitor:
${dbcp_test_home}/scripts/270.sh --monitoroff